Dumbbell



FIG. 1 is a perspective view of a dumbbell showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is is an exploded view thereof.

The broken lines shown in the drawings are for the purpose ofillustrating portions of dumbbell, which form no part of the claimeddesign.

CLAIM The ornamental design for a dumbbell, as shown and described.